I logged on when there were no people on rof and noticed that although the wave timer had only a bit of time left, the lava had barely flowed. Look at my image and note the round time left:
Apparently, lava doen't flow when there are no people on the map. I can't really verify it though becaue I rarely log on when there were no people on.
Apology for the weird grammar, but the key between my A and D became broken, and I had to make do without it.

Apparently, lava doen't flow when there are no people on the map. I can't really verify it though becaue I rarely log on when there were no people on.
Apology for the weird grammar, but the key between my A and D became broken, and I had to make do without it.